CVE-2021-3737

Description

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

CVSS breakdown

Affected products

• Canonical / Ubuntu Linux20.04 – 20.04
• Canonical / Ubuntu Linux21.04 – 21.04
• Canonical / Ubuntu Linux14.04 – 14.04
• Canonical / Ubuntu Linux16.04 – 16.04
• Canonical / Ubuntu Linux18.04 – 18.04
• fedoraproject / fedora33 – 33
• fedoraproject / fedora34 – 34
• NetApp / hci
• NetApp / management_services_for_element_software
• NetApp / netapp_xcp_smb
• NetApp / ONTAP Select Deploy administration utility
• NetApp / xcp_nfs
• oracle / communications_cloud_native_core_binding_support_function22.1.3 – 22.1.3
• oracle / communications_cloud_native_core_network_exposure_function22.1.1 – 22.1.1
• oracle / communications_cloud_native_core_policy22.2.0 – 22.2.0
• Python / python3.6.0 – 3.6.14
• RedHat / codeready_linux_builder8.0 – 8.0
• RedHat / codeready_linux_builder_for_ibm_z_systems8.0 – 8.0
• RedHat / codeready_linux_builder_for_power_little_endian8.0 – 8.0
• RedHat / enterprise_linux6.0 – 6.0
• RedHat / enterprise_linux8.0 – 8.0
• RedHat / enterprise_linux7.0 – 7.0
• RedHat / enterprise_linux_for_ibm_z_systems8.0 – 8.0
• RedHat / enterprise_linux_for_power_little_endian8.0 – 8.0

References

• MISChttps://bugs.python.org/issue44022
• PATCHhttps://github.com/python/cpython/pull/25916
• MISChttps://bugzilla.redhat.com/show_bug.cgi?id=1995162
• PATCHhttps://github.com/python/cpython/pull/26503
• VENDOR_ADVISORYhttps://ubuntu.com/security/CVE-2021-3737
• VENDOR_ADVISORYhttps://www.oracle.com/security-alerts/cpujul2022.html
• MISChttps://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
• MISChttps://security.netapp.com/advisory/ntap-20220407-0009/
• MAILING_LISThttps://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• MAILING_LISThttps://lists.debian.org/debian-lts-announce/2023/06/msg00039.html